WO2018193901A1 - ポリプロピレン系樹脂発泡粒子およびその製造方法 - Google Patents
ポリプロピレン系樹脂発泡粒子およびその製造方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3461—Making or treating expandable particles
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/16—Making expandable particles
- C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
- C08J9/232—Forming foamed products by sintering expandable particles
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/06—CO2, N2 or noble gases
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/22—Expandable microspheres, e.g. Expancel®
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- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
- C08J2205/044—Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/267—Magnesium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K2003/343—Peroxyhydrates, peroxyacids or salts thereof
Definitions
- the present invention relates to a polypropylene resin expanded particle and a method for producing the same.
- An in-mold foam molded product obtained by filling polypropylene resin expanded particles in a mold and thermoforming has features such as shape flexibility, light weight, and heat insulation, which are the advantages of the in-mold foam molded product. .
- shape flexibility compared with in-mold foam moldings using similar synthetic resin foam particles
- polystyrene resin foam particles chemical resistance, heat resistance, strain recovery after compression The rate is excellent.
- the dimensional accuracy, heat resistance, and compressive strength are superior to the in-mold foam molded article using polyethylene resin expanded particles.
- in-mold foam molded articles obtained using polypropylene resin foam particles are used in various applications such as heat insulating materials, shock-absorbing packaging materials, automobile interior members, and automobile bumper core materials.
- Such an in-mold foam molding is usually a white in-mold foam molding reflecting the color of the polypropylene resin itself without the addition of a pigment, or a black in-mold foam molding in which carbon black or the like is added as a pigment in the resin.
- the body is often used.
- a wide variety of products have been developed. From the viewpoint of functionality such that scratches and dirt are less noticeable, and from the viewpoint of design to differentiate from conventional products, it is not white or black,
- the demand for gray in-mold foam moldings is increasing.
- a black additive such as carbon black may be used for a white resin.
- Patent Document 1 discloses an invention for obtaining gray polyolefin resin expanded particles by adding a small amount of carbon black.
- the gray polyolefin resin expanded particles disclosed in this document include those with uneven color, which is insufficient to stably obtain gray polyolefin resin expanded particles having a uniform and excellent color tone. is there.
- Patent Document 2 discloses an invention for obtaining polyolefin resin expanded particles to which carbon black and metal salt hydrate are added. This document discloses an invention for expressing flame retardancy by blending an inexpensive flame retardant while using carbon black, and obtains gray polyolefin resin expanded particles having a uniform and excellent color tone. There is no mention of that.
- Patent Document 3 discloses an invention for obtaining polypropylene resin expanded particles to which carbon black and a metal borate are added. This document mentions the effect of eliminating color unevenness, but does not mention anything about obtaining gray polypropylene-based resin expanded particles having excellent color tone.
- Patent Document 4 discloses an invention for obtaining expanded polyolefin resin particles to which a magnesium salt of a higher fatty acid is added. This document discloses an invention for obtaining foamed particles having a large cell diameter and excellent in-mold moldability. However, there is nothing about obtaining gray polyolefin resin foamed particles having a uniform and excellent color tone. Not mentioned.
- Patent Document 5 discloses an invention for obtaining an in-mold foam molded body of a polyolefin resin to which carbon black and a fatty acid salt are added. This document discloses an invention for obtaining an in-mold foam molded article having no color unevenness by injection foam molding, and makes no mention of obtaining gray foam particles having excellent color tone.
- An object of the present invention is to provide a polypropylene resin expanded particle capable of obtaining a gray in-mold expanded molded article having a uniform and excellent color tone.
- the present inventors surprisingly have excellent color tone by using carbon dioxide as a foaming agent and foaming a polypropylene resin particle containing carbon black and magnesium hydroxide and / or magnesium carbonate. It has been found that expanded particles can be obtained. That is, this invention consists of the following structures.
- a method for producing polypropylene resin expanded particles comprising the following steps: (I) Polypropylene containing 1.0 to 25 parts by weight of carbon black and 0.05 to 1.0 parts by weight of magnesium hydroxide and / or magnesium carbonate with respect to 100 parts by weight of polypropylene resin A step of dispersing resin particles and carbon dioxide in an aqueous dispersion medium in a sealed container to obtain a dispersion; (Ii) heating and pressurizing the dispersion, and (Iii) A step of releasing the polypropylene resin particles contained in the dispersion into a pressure range lower than the internal pressure of the sealed container.
- a polypropylene resin expanded particle capable of obtaining a gray in-mold expanded molded article having a uniform and excellent color tone.
- FIG. (1) is a figure which shows the color of the surface of the in-mold foaming molding obtained by this-application comparative example 2.
- FIG. (2) is a figure which shows the color of the surface of the in-mold foaming molding obtained by this-application comparative example 1.
- FIG. (3) is a figure which shows the color of the surface of the in-mold foaming molding obtained in this-application Example 1.
- the expanded polypropylene resin particles according to an embodiment of the present invention are 1.0 to 25 parts by weight of carbon black and 0.05 to 0.05 of magnesium hydroxide and / or magnesium carbonate with respect to 100 parts by weight of the polypropylene resin. It is characterized by containing not less than 1.0 parts by weight and not more than parts by weight, and the surface color satisfies the following (a), (b) and (c).
- the expanded polypropylene resin particles according to one embodiment of the present invention are 1.0 parts by weight or more of carbon black and 0.05 parts by weight of magnesium hydroxide and / or magnesium carbonate with respect to 100 parts by weight of the polypropylene resin. It is obtained by foaming polypropylene resin particles containing 1.0 part by weight or less using carbon dioxide as a foaming agent, and shows a uniform gray with excellent color tone.
- polypropylene-based resin expanded particles are also referred to as “expanded particles”
- in-mold expanded molded products are also referred to as “molded products”.
- the polypropylene resin used as the base resin in one embodiment of the present invention is not particularly limited as long as it contains propylene as the main component of the monomer.
- it is a propylene homopolymer, olefin-propylene random copolymer.
- examples thereof include a polymer and an olefin-propylene block copolymer. These may be used alone or in combination of two or more.
- Examples include ⁇ -olefins such as heptene, 3-methyl-1-hexene, 1-octene, and 1-decene, and cyclopentene, norbornene, and tetracyclo [6,2,11,8,13,6] -4- Cyclic olefins such as dodecene, dienes such as 5-methylene-2-norbornene, 5-ethylidene-2-norbornene, 1,4-hexadiene, methyl-1,4-hexadiene, 7-methyl-1,6-octadiene, etc. Can be mentioned.
- these olefins having 2 or 4 or more carbon atoms may be used alone or in combination of two or more.
- ethylene or ⁇ -olefin is preferable and ethylene and 1-butene are most preferable from the viewpoint of availability, economical efficiency, and mechanical properties.
- the copolymerizable olefin content in the polypropylene resin used in one embodiment of the present invention is preferably 0% by weight or more and 10% by weight or less, more preferably 1.0% by weight or more and 7.0% by weight or less. More preferably, it is more preferably from 5% by weight to 6.0% by weight, particularly preferably from 1.5% by weight to 5.0% by weight.
- the copolymerizable olefin content in the polypropylene resin is within the above range, the moldability and mechanical strength of the resulting polypropylene resin-in-mold foam molded product tend to be good.
- the polypropylene resin used in one embodiment of the present invention includes vinyl chloride, vinylidene chloride, acrylonitrile, vinyl acetate, acrylic acid, methacrylic acid, maleic acid, and ethyl acrylate, as long as the object of the present invention is not impaired.
- Vinyl monomers such as butyl acrylate, methyl methacrylate, maleic anhydride, styrene, methyl styrene, vinyl toluene, and divinyl benzene may be copolymerized.
- olefin-propylene random copolymers containing ethylene and / or 1-butene such as ethylene-propylene random
- a copolymer, a 1-butene-propylene random copolymer, and an ethylene-1-butene-propylene random copolymer can be preferably used.
- the melting point of the polypropylene resin used in one embodiment of the present invention is not particularly limited, but is preferably 130 ° C. or higher and 160 ° C. or lower, more preferably 140 ° C. or higher and 155 ° C. or lower.
- the melting point of the polypropylene resin is in the above-described range, there is a tendency that an in-mold foam molded article having an excellent balance between mechanical strength and surface appearance tends to be obtained.
- the melting point in an embodiment of the present invention is a differential scanning calorimeter DSC, and polypropylene resin or polypropylene resin particles 1 mg to 10 mg are increased from 40 ° C. to 220 ° C. at a rate of 10 ° C./min.
- the endothermic peak in the DSC curve obtained when the temperature is then cooled from 220 ° C. to 40 ° C. at a rate of temperature decrease of 10 ° C./min, and the temperature is increased again from 40 ° C. to 220 ° C. at a rate of 10 ° C./min Of the peak temperature.
- the melt flow rate (hereinafter sometimes referred to as MFR) of the polypropylene resin used in an embodiment of the present invention is preferably 3.0 g / 10 min or more and 12 g / 10 min or less, more preferably 5 It is 0.0 g / 10 min or more and 9.0 g / 10 min or less.
- MFR melt flow rate
- the MFR in one embodiment of the present invention uses an MFR measuring instrument described in JIS K7210, and has an orifice of 2.0959 ⁇ 0.005 mm ⁇ , an orifice length of 8.000 ⁇ 0.025 mm, a load of 2160 g, and 230 ⁇ 0.2 ° C. It is the value when measured under conditions.
- the polypropylene resin used in one embodiment of the present invention can be obtained using a catalyst such as a Ziegler catalyst, a metallocene catalyst, a post metallocene catalyst, or the like.
- a catalyst such as a Ziegler catalyst, a metallocene catalyst, a post metallocene catalyst, or the like.
- a Ziegler catalyst is used, a polymer having a large Mw / Mn tends to be obtained.
- the polypropylene resin used in one embodiment of the present invention can be adjusted in characteristics such as molecular weight and melt flow rate by oxidative decomposition using an organic peroxide.
- oxidatively decompose the polypropylene resin for example, a polypropylene resin added with an organic peroxide can be heated and melted in an extruder.
- the primary particle size of the carbon black used in one embodiment of the present invention is not limited, but generally it is preferably larger than 0 nm and not larger than 500 nm. From the viewpoint of the balance between flame retardancy of the in-mold foam molded product and mechanical strength, the primary particle size of carbon black is more preferably 10 nm or more and 100 nm or less. Examples of such carbon black include channel black, roller black, disk, gas furnace black, oil furnace black, thermal black, acetylene black, and the like, and one or more of these can be used.
- the primary particle size of carbon black in one embodiment of the present invention was obtained by taking a photograph of the cross section of the cell membrane of the obtained polyolefin-based resin expanded particles magnified 40,000 times with a transmission electron microscope, and obtaining the obtained transmission In a scanning electron micrograph, the particle diameters (Ferre diameter) in the X direction and Y direction of 50 carbon black primary particles are measured arbitrarily, and the average value is calculated.
- the content of such carbon black is 1.0 to 25 parts by weight of carbon black with respect to 100 parts by weight of the polypropylene resin. It is preferably 2.0 parts by weight or more and 20 parts by weight or less, more preferably 2.0 parts by weight or more and 15 parts by weight or less, still more preferably 2.0 parts by weight or more and 10 parts by weight or less, and most preferably 2.0 parts by weight or more and 8.0 parts by weight or less.
- content of carbon black is less than 1.0 part by weight, color unevenness of the obtained polypropylene resin expanded particles tends to be noticeable.
- content exceeds 25 weight part it exists in the tendency for the flame retardance of the polypropylene resin-type in-mold foam molding obtained to deteriorate.
- the carbon black when producing resin particles containing carbon black, is used as a polyolefin resin in which carbon black is dispersed (hereinafter referred to as “carbon black masterbatch”). It is preferable to melt knead together with a polypropylene resin.
- the polyolefin resin used in the carbon black masterbatch include a polyethylene resin and a polypropylene resin, and a polypropylene resin is preferable.
- the polypropylene resin used in the carbon black masterbatch is preferably selected from those listed above for the polypropylene resin used in the present invention.
- the MFR of the polypropylene resin is preferably 3.0 g / 10 min or more and 15 g / 10 min or less, more preferably 5.0 g / 10 min or more and 9.0 g / 10 min or less. When the MFR is within this range, kneadability with the polypropylene resin used in one embodiment of the present invention tends to be improved.
- the carbon black concentration in the carbon black masterbatch is preferably 5.0% by weight to 60% by weight, and more preferably 20% by weight to 50% by weight.
- a stabilizer or a lubricant may be added to the carbon black masterbatch.
- the carbon black masterbatch can be produced by melt-kneading polyolefin resin and carbon black using an extruder, kneader, Banbury mixer (registered trademark), roll, or the like.
- the magnesium hydroxide and magnesium carbonate used in one embodiment of the present invention are not particularly limited as long as they are available.
- the primary particle size of magnesium hydroxide and magnesium carbonate used in one embodiment of the present invention is not limited, but is generally greater than 0.01 ⁇ m and less than or equal to 50 ⁇ m. From the viewpoint of dispersibility in polypropylene resin and forming a uniform cell structure of polypropylene resin expanded particles, the thickness is more preferably 0.1 ⁇ m or more and 10 ⁇ m or less.
- the content of magnesium hydroxide and / or magnesium carbonate according to an embodiment of the present invention is 0.05 part by weight or more and 1.0 part by weight or less with respect to 100 parts by weight of the polypropylene resin.
- the content of magnesium hydroxide and / or magnesium carbonate is more preferably 0.1 parts by weight or more and 0.5 parts by weight or less.
- the content of magnesium hydroxide and / or magnesium carbonate is within the above range, it is possible to obtain polypropylene-based resin expanded particles that exhibit a gray color that is uniform and excellent in color tone.
- the content is less than 0.05 parts by weight, color unevenness of the obtained polypropylene resin expanded particles tends to be noticeable.
- the content of magnesium hydroxide and / or magnesium carbonate exceeds 1 part by weight, the surface appearance of the resulting polypropylene resin-in-mold foam-molded product tends to deteriorate.
- Examples of the method for producing polypropylene resin particles in one embodiment of the present invention include the following methods.
- a polypropylene resin and carbon black, magnesium hydroxide and / or magnesium carbonate, and if necessary, a mixture of other additives are mixed by a mixing method such as a dry blend method or a master batch method.
- the resulting mixture is melt-kneaded using an extruder, kneader, Banbury mixer (registered trademark), roll, etc., and then chopped using a cutter, pelletizer, etc., to obtain a particle shape, thereby producing a polypropylene system Resin particles are obtained.
- the polypropylene resin particles of one embodiment of the present invention may contain a cell nucleating agent, a hydrophilic compound, an antioxidant, an antistatic agent, a flame retardant, etc. as other additives as necessary. it can.
- Such an additive may be preliminarily added to another resin in a high concentration to form a master batch, and this master batch resin may be added to the polypropylene resin.
- the resin used for such a masterbatch resin is preferably a polyolefin resin, and more preferably a masterbatch made of a polypropylene resin among polyolefin resins.
- water in the aqueous dispersion medium when a hydrophilic compound is contained in the polypropylene resin particles, water in the aqueous dispersion medium also acts as a foaming agent, which contributes to an improvement in the expansion ratio.
- the hydrophilic compound used in one embodiment of the present invention is a water-absorbing ionic compound such as sulfate, borate or carbonate, or a carboxyl group, hydroxyl group, amino group, sulfo group or polyoxyethylene in the molecule. It is a compound containing a hydrophilic group such as a group or a derivative thereof, and includes a hydrophilic polymer.
- examples of the compound containing a carboxyl group include lauric acid and sodium laurate, and examples of the compound containing a hydroxyl group include ethylene glycol and glycerin.
- examples of other hydrophilic organic compounds include organic compounds having a triazine ring such as melamine (chemical name: 1,3,5-triazine-2,4,6-triamine), isocyanuric acid, and isocyanuric acid condensate. . These may be used alone or in combination of two or more.
- the hydrophilic polymer is a polymer having a water absorption measured in accordance with ASTM D570 of 0.5% by weight or more, and is a so-called hygroscopic polymer; several to several times its own weight without dissolving in water. It includes a water-absorbing polymer that absorbs water 100 times and is difficult to dehydrate even under pressure; and a water-soluble polymer that dissolves in water at a temperature of 15 ° C. or higher.
- hydrophilic polymer examples include, for example, ethylene-acrylic acid-maleic anhydride terpolymers and carboxylic acid groups of ethylene- (meth) acrylic acid copolymers such as alkali metal ions such as sodium ions and potassium ions.
- Ionomer-based resins neutralized with transition metal ions such as zinc ions and crosslinked between molecules; carboxyl group-containing polymers such as ethylene- (meth) acrylic acid copolymers; nylon-6, nylon-6,6, Polyamides such as copolymer nylon; Nonionic water-absorbing polymers such as polyethylene glycol and polypropylene glycol; Polyether-polyolefin resin block copolymers represented by Pelestat (trade name, manufactured by Sanyo Kasei Co., Ltd.); Aqua Coke (product) Name, manufactured by Sumitomo Seika Co., Ltd.) De polymer; and the like. These may be used alone or in combination of two or more.
- nonionic water-absorbing polymers and polyether-polyolefin resin block copolymers have relatively good dispersion stability in a pressure-resistant container, and absorb water when added in a relatively small amount. It is preferable because it exhibits its properties.
- hydrophilic compounds glycerin, polyethylene glycol, polypropylene glycol, and melamine are preferable because the effects of the present invention are great.
- the content of the hydrophilic compound in the polypropylene resin expanded particles of one embodiment of the present invention is preferably 0.01 parts by weight or more and 10 parts by weight or less, and 0.03 parts by weight or more with respect to 100 parts by weight of the polypropylene resin. 5 parts by weight or less is more preferable, and 0.05 part by weight or more and 1 part by weight or less is more preferable.
- the content of the hydrophilic compound is in this range, the expansion ratio is likely to be improved, and the appearance and mechanical properties of the obtained in-mold foam molded product are likely to be good.
- inorganic nucleating agents such as talc, calcium stearate, calcium carbonate, silica, kaolin, titanium oxide, bentonite, barium sulfate are generally used. These may be used alone or in combination of two or more. Among these cell nucleating agents, a cell having uniform talc can be obtained, which is preferable.
- the content of the cell nucleating agent may be appropriately adjusted depending on the intended cell diameter and the type of the nucleating agent, but the cell nucleating agent is 0.001 part by weight or more with respect to 100 parts by weight of the polypropylene resin. The amount is preferably not more than parts by weight, more preferably not less than 0.01 parts and not more than 1 part by weight. When the content of the cell nucleating agent is within the range, cells having a uniform size suitable for expanded particles can be easily obtained.
- the weight per one polypropylene resin particle is preferably 0.2 mg or more and 10 mg or less, and more preferably 0.5 mg or more and 6.0 mg or less.
- the weight per polypropylene resin particle is within the above range, the dimensions and filling properties of the obtained in-mold foam-molded product tend to be good.
- the weight per one polypropylene resin particle is an average resin particle weight obtained from 100 particles of randomly selected polypropylene resin particles.
- composition and particle weight of the polypropylene resin particles hardly change even after the foaming process and the in-mold foam molding process, and the same properties are exhibited even when the foam particles and the in-mold foam molding are remelted.
- polypropylene resin foam particles are produced using the polypropylene resin particles thus obtained.
- the method for producing expanded polypropylene resin particles in an embodiment of the present invention includes the following steps: (I) Polypropylene containing 1.0 to 25 parts by weight of carbon black and 0.05 to 1.0 parts by weight of magnesium hydroxide and / or magnesium carbonate with respect to 100 parts by weight of polypropylene resin A step of dispersing resin particles and carbon dioxide in an aqueous dispersion medium in a sealed container to obtain a dispersion; (Ii) heating and pressurizing the dispersion, and (Iii) A step of releasing the polypropylene resin particles contained in the dispersion into a pressure range lower than the internal pressure of the sealed container.
- Carbon dioxide is used as the foaming agent in one embodiment of the present invention.
- the mechanism is unknown at this stage, but the polypropylene resin particles containing carbon black and magnesium hydroxide and / or magnesium carbonate can be expanded by using carbon dioxide as a foaming agent to foam the polypropylene resin particles. Gray expanded polypropylene resin particles having excellent color tone can be obtained.
- Carbon dioxide is an inorganic gas foaming agent with a small environmental load, and is suitable because it can be used as a foaming agent to obtain a polypropylene resin in-mold foam molded article having a good appearance.
- an inorganic gas such as air, nitrogen, oxygen, etc. may be used in combination as long as the quality of the obtained foamed molded product in the polypropylene resin mold is not impaired.
- air remaining in a sealed container used for foaming hardly affects the quality of the obtained foamed molded product in a polypropylene resin mold, and may be used in combination.
- the method for producing polypropylene resin expanded particles in one embodiment of the present invention includes, for example, dispersing polypropylene resin particles in an aqueous dispersion medium in a closed container, impregnating carbon dioxide as a foaming agent,
- the process includes a step of releasing polypropylene resin particles heated to a temperature equal to or higher than the softening temperature (foaming temperature) into a pressure range lower than the internal pressure of the sealed container to obtain polypropylene resin foam particles.
- Such a process is also referred to as a “single-stage foaming process”
- the polypropylene-based resin foam particles obtained by such a “single-stage foaming process” may be referred to as “single-stage foaming particles”.
- “more than the softening temperature of polypropylene resin particles” means that the melting point of the polypropylene resin used is ⁇ 10 ° C. or more.
- the foaming temperature of the polypropylene resin particles is not particularly limited, but is preferably equal to or higher than the softening temperature of the polypropylene resin particles.
- the softening temperature or higher of the polypropylene resin particles is not particularly limited as long as the melting point of the polypropylene resin used is ⁇ 10 ° C. or higher.
- the melting point of the polypropylene resin used is preferably ⁇ 10 ° C. or higher, The melting point is more preferably ⁇ 10 ° C. or higher and the melting point + 10 ° C. or lower.
- the temperature of the atmosphere in which the polypropylene resin particles are released may be adjusted to about room temperature to about 110 ° C. for the purpose of adjusting the expansion ratio.
- the pressure for impregnating the foaming agent in the closed container is preferably about 1.5 MPa (gauge pressure) or more and 5.0 MPa or less (gauge pressure). More preferably, the pressure is 1.5 MPa (gauge pressure) or more and 3.5 MPa or less (gauge pressure).
- a foaming pressure is synonymous with the internal pressure of the airtight container in process (iii).
- Specific examples of the method for producing expanded polypropylene resin particles in one embodiment of the present invention include the following methods.
- a method of increasing the expansion ratio of the polypropylene resin expanded particles there are, for example, a method of increasing the internal pressure in the sealed container, increasing the pressure release speed, and increasing the temperature in the sealed container before discharge.
- aqueous dispersion medium used in one embodiment of the present invention it is preferable to use only water, but a dispersion medium in which methanol, ethanol, ethylene glycol, glycerin or the like is added to water can also be used.
- the sealed container used in one embodiment of the present invention is not particularly limited as long as it can withstand the pressure in the container and the temperature in the container at the time of producing the foamed particles, and examples thereof include an autoclave type pressure resistant container. .
- a dispersant in the aqueous dispersion medium in order to prevent coalescence of the polypropylene-based resin particles.
- examples of the dispersant used in one embodiment of the present invention include inorganic dispersants such as tricalcium phosphate, tribasic magnesium phosphate, basic magnesium carbonate, calcium carbonate, barium sulfate, kaolin, talc, and clay.
- dispersants may be used alone or in combination of two or more.
- a dispersion aid together with a dispersant.
- dispersion aid used in one embodiment of the present invention include, for example, N-acyl amino acid salts, alkyl ether carboxylates, carboxylate types such as acylated peptides; alkyl sulfonates, n-paraffin sulfones.
- Sulfonates such as acid salts, alkylbenzene sulfonates, alkylnaphthalene sulfonates, sulfosuccinates; sulfuric acids such as sulfated oils, alkyl sulfates, alkyl ether sulfates, alkyl amide sulfates, alkyl allyl ether sulfates
- Anionic surfactants such as ester types; phosphate ester types such as alkyl phosphates and polyoxyethylene phosphates;
- dispersion aid polycarboxylic acid type polymer surfactants such as maleic acid copolymer salts and polyacrylates; polyvalent anions such as polystyrene sulfonates and naphthalsulfonic acid formalin condensate salts Polymeric surfactants can also be used. These dispersing aids may be used alone or in combination of two or more.
- the amount of dispersant and dispersion aid used in an embodiment of the present invention varies depending on the type and the type and amount of polypropylene resin particles used. Usually, it is preferable to blend the dispersant in an amount of 0.1 part by weight to 3 parts by weight with respect to 100 parts by weight of the aqueous dispersion medium. Is preferred.
- the polypropylene resin particles are usually preferably used in an amount of 20 to 100 parts by weight with respect to 100 parts by weight of the aqueous dispersion medium.
- a single-stage expanded particle is impregnated with an inorganic gas (for example, air, nitrogen, carbon dioxide, etc.) to give an internal pressure, and then contacted with water vapor at a specific pressure.
- an inorganic gas for example, air, nitrogen, carbon dioxide, etc.
- Polypropylene-based resin expanded particles having an expansion ratio improved compared to the expanded particles can be obtained.
- the foaming process in which the polypropylene resin foamed particles are further foamed to obtain the polypropylene resin foamed particles having a higher expansion ratio may be referred to as a “two-stage foaming process”.
- the polypropylene resin expanded particles obtained through the above process may be referred to as “two-stage expanded particles”.
- the internal pressure of the inorganic gas impregnated in the first-stage expanded particles is preferably changed in consideration of the expansion ratio of the second-stage expanded particles, but is 0.12 MPa (absolute pressure) or 0.60 MPa (absolute pressure). It is preferable.
- the water vapor pressure in the two-stage foaming step is preferably adjusted to 0.02 MPa (gauge pressure) or more and 0.25 MPa (gauge pressure) or less in consideration of the expansion ratio of the two-stage foam particles. It is more preferable to adjust at 03 MPa (gauge pressure) or more and 0.15 MPa (gauge pressure) or less.
- the closed cell ratio of the polypropylene resin expanded particles of one embodiment of the present invention obtained through the “one-stage foaming process” or “two-stage foaming process” is preferably 88% or more, and 93% or more. Is more preferable.
- the closed cell ratio of the polypropylene resin foamed particles is less than 88%, internal gas tends to flow out of the foamed particles at the time of in-mold foam molding, and the deformation after molding tends to increase.
- the closed cell ratio is calculated by calculating the closed cell volume of the polypropylene resin expanded particles using an air comparison type hydrometer, and dividing the closed cell volume by the apparent volume separately obtained by the ethanol immersion method. Is the value to be
- polypropylene resin foam particles according to an embodiment of the present invention, 5-6 mg of polypropylene resin foam particles are heated from 40 ° C. to 220 ° C. at a temperature increase rate of 10 ° C./min, as measured by differential scanning calorimetry. It is preferred to have two melting peaks in the resulting DSC curve.
- the expanded polypropylene resin particles of one embodiment of the present invention preferably have a DSC ratio of 10% to 50%, more preferably 15% to 30%. When the DSC ratio is within this range, a polypropylene resin-in-mold foam-molded product having a high surface beauty is easily obtained.
- the DSC ratio is the amount of heat surrounded by the melting peak on the low temperature side of the DSC curve and the tangent to the melting start baseline from the maximum point between the melting peak on the low temperature side and the melting peak on the high temperature side.
- a certain low-temperature melting peak calorie is surrounded by Ql, the melting peak on the high-temperature side of the DSC curve, and the tangent to the melting end baseline from the maximum point between the low-temperature melting peak and the high-temperature melting peak
- the melting peak heat quantity on the high temperature side which is the amount of heat
- Qh the ratio [Qh / (Ql + Qh) ⁇ 100] of the melting peak on the high temperature side calculated from these.
- the foamed particles having the desired DSC ratio can be obtained by appropriately adjusting the foaming temperature and the foaming pressure. Obtainable.
- the DSC ratio tends to decrease, and it also depends on the type of polypropylene resin, additive, and type of foaming agent. Specifically, when the foaming temperature is raised by 1 ° C., the DSC ratio is reduced by about 5 to 20%, and when the foaming pressure is raised by 0.1 MPa, the DSC ratio is reduced by about 0.5 to 5%.
- the expansion ratio of the polypropylene resin expanded particles of one embodiment of the present invention obtained by the above-described production method is not particularly limited and may be adjusted as necessary, but from the viewpoint of mechanical strength, it is 3 to 40 times. Or less, and more preferably 3 to 25 times.
- the expansion ratio of the expanded polypropylene resin particles refers to the weight w (g) of expanded polypropylene resin particles, which is then submerged in a graduated cylinder containing ethanol, and the water level rise (submerged method) of the graduated cylinder.
- the average cell diameter of the expanded polypropylene resin particles of one embodiment of the present invention is preferably 100 ⁇ m or more and 500 ⁇ m or less, and more preferably 120 ⁇ m or more and 400 ⁇ m or less. When the average cell diameter of the expanded polypropylene resin particles is within the range, the appearance of the obtained expanded foam in the polypropylene resin mold tends to be good.
- the average bubble diameter is a value measured as follows. Polypropylene-based resin foam particles are cut at the center of the foam particles using a double-edged razor [Feather, high stainless steel double-edged]. The cut surface is observed with an optical microscope [manufactured by Keyence Corporation, VHX-100] at a magnification of 50 to obtain an image of the cut surface. In the obtained image, draw a straight line passing through almost the center of the foamed particle, and read the number of bubbles n through which the straight line passes, and the foamed particle diameter L ( ⁇ m) determined from the intersection of the straight line and the foamed particle surface. Calculated from the following equation.
- the color of the expanded polypropylene resin particles in one embodiment of the present invention is measured and evaluated as follows.
- the expanded particles (sample) are sandwiched between two steel plates, and the expanded particles are compressed with a Yankee vice until they become a sheet. While being fixed in this state, it is heated (60 ° C.) for 30 minutes with a dryer to form expanded particles into a sheet.
- the obtained sheet-like sample is placed on a scanner stand of a printer multifunction device (iR-ADV C5035, manufactured by Canon Inc.) and scanned, and image processing software (DIBAS32) is applied to the image of the surface of the sheet-like sample.
- DIBAS32 image processing software
- the mode value (measurement value) of the RGB value of the obtained sample surface is measured.
- the above-described measurement of the mode value (measured value) of the RGB value is carried out for 20 expanded particles, and the mode value (average value) of the RGB values of the obtained 20 sheet-like samples is obtained.
- the mode value (measured value) of the RGB value of the sample 20 (R20, G20, B20)
- the mode value (average value) of the RGB value ((R1 + R2 + ... + R20) / 20, (G1 + G2 +... + G20) / 20, (B1 + B2 +... + B20) / 20).
- RGB value is a kind of color expression method, and it can reproduce a wide range of colors by mixing three primary colors of red (Red), green (Green), and blue (Blue).
- Each numerical value of R, G, and B is expressed in 256 levels from 0 to 255.
- an RGB value satisfying the following condition 1 is evaluated as gray
- an RGB value satisfying the condition 2 is evaluated as black
- an RGB value not satisfying the conditions 1 and 2 is evaluated as another color.
- RGB value satisfying condition 1 Black: RGB value satisfying condition 2 Other colors: RGB values not satisfying conditions 1 and 2.
- Condition 1 The mode value (average value) of RGB values is a value satisfying (a), (b) and (c); (A) When the maximum value of any of the R, G, and B values is RGB (Max), RGB (Max) ⁇ 230 (B) When the minimum value of any of R, G, and B is RGB (Min), RGB (Min) ⁇ 70 (C) RGB (Max) ⁇ RGB (Min) ⁇ 20
- Condition 2 The mode value (average value) of RGB values is a value satisfying (d), (e), and (f); (D) When the maximum value of any of R, G, and B is RGB (Max), RGB (Max) ⁇ 40 (E) RGB (Min) ⁇ 0 when the minimum value of any of R, G, B is RGB (Min) (F) RGB (Max) ⁇ RGB (Min) ⁇ 10
- the color unevenness of the polypropylene resin expanded particles in one embodiment of the present invention is evaluated as follows using the mode value (measured value) of the RGB values.
- the maximum value of RGB (Max) is RGB (Max) i
- the minimum value of RGB (Min) is RGB (Min) i.
- Evaluation is based on the difference (RGB (Max) i ⁇ RGB (Min) i) between RGB (Max) i and RGB (Min) i.
- the difference between RGB (Max) i and RGB (Min) i is preferably 50 or less, and more preferably 30 or less.
- the evaluation result obtained by scanning the sheet obtained from the foamed particles and performing RGB analysis and the evaluation result obtained by scanning the smooth surface and performing RGB analysis It is equivalent.
- the method for producing an in-mold foam molded body from the foamed particles according to an embodiment of the present invention is, for example, filling a mold in which a polypropylene resin foamed particle can be closed but cannot be sealed, and heated with steam or the like.
- the foamed particles are heat-fused with each other and molded according to a mold, cooled with a coolant such as water, and then taken out to obtain an in-mold foam molded body.
- the polypropylene-based resin expanded particles apply a pressure higher than the atmospheric pressure inside the expanded particles before in-mold foam molding.
- In-mold foam molding using foam particles in which a pressure equal to or higher than the atmospheric pressure is applied to the inside of the foam particles makes it easy to obtain a polypropylene resin in-mold foam molded article with good surface appearance and little deformation.
- a pressure can be provided inside a foamed particle by methods, such as the conventionally known internal pressure provision method and the compression filling method.
- the expanded foamed particles are preliminarily held under pressure of an inorganic gas to apply an internal pressure higher than the atmospheric pressure in the expanded particles, and the expanded particles to which the internal pressure is applied can be closed but not sealed. Fill the molding space such as mold.
- the internal pressure is preferably 0.12 MPa (absolute pressure) or more and 0.40 MPa (absolute pressure) or less, more preferably 0.14 MPa (absolute pressure) or more and 0.30 MPa (absolute pressure) or less.
- the inorganic gas used for applying the internal pressure air, nitrogen, helium, neon, argon, carbon dioxide or the like can be used. These gases may be used alone or in combination of two or more. Among these, since versatility is high, air and nitrogen are preferable.
- the polypropylene resin foam particles are compressed in a compression tank using a pressurized gas, preferably to a bulk density of 1.25 to 3.0 times the bulk density of the foam particles before filling, more preferably Compressed to a bulk density of 1.5 to 2.2 times the bulk density of the foamed particles before filling, and filled in a molding space such as a mold that can close the compressed foamed particles but does not seal.
- a pressurized gas preferably to a bulk density of 1.25 to 3.0 times the bulk density of the foam particles before filling, more preferably Compressed to a bulk density of 1.5 to 2.2 times the bulk density of the foamed particles before filling, and filled in a molding space such as a mold that can close the compressed foamed particles but does not seal.
- pressurized gas used for the compression air, nitrogen, helium, neon, argon, carbon dioxide or the like can be used. These gases may be used alone or in combination of two or more. Among these, highly versatile air and nitrogen are preferable.
- the heating steam pressure is about 0.15 to 0.40 MPa (gauge pressure) using steam or the like as a heating medium for about 3 to 50 seconds.
- the mold is cooled by water cooling, and then the mold is opened to obtain a foam in a polypropylene resin mold.
- the in-mold foamed molded body having a small intergranular surface and high blackness can be obtained. It leads to reduction of energy consumption.
- a method for producing polypropylene resin expanded particles comprising the following steps: (I) Polypropylene containing 1.0 to 25 parts by weight of carbon black and 0.05 to 1.0 parts by weight of magnesium hydroxide and / or magnesium carbonate with respect to 100 parts by weight of polypropylene resin A step of dispersing resin particles and carbon dioxide in an aqueous dispersion medium in a sealed container to obtain a dispersion; (Ii) heating and pressurizing the dispersion, and (Iii) A step of releasing the polypropylene resin particles contained in the dispersion into a pressure range lower than the internal pressure of the sealed container.
- a foamed molded article composed of the polypropylene resin foamed particles according to any one of [4] to [6].
- the present invention can be configured as follows.
- Resin particles and carbon dioxide are dispersed in an aqueous dispersion medium in a sealed container, heated and pressurized to a temperature higher than the softening temperature of the polypropylene resin particles, and then released to a pressure range lower than the internal pressure of the sealed container.
- Carbon black is contained in an amount of 1.0 to 25 parts by weight and magnesium hydroxide and / or magnesium carbonate is contained in an amount of 0.05 to 1.0 parts by weight based on 100 parts by weight of a polypropylene resin.
- Polypropylene-based resin expanded particles exhibiting colors that satisfy (a), (b), and (c): (A) When the maximum value of any of the R, G, and B values is RGB (Max), RGB (Max) ⁇ 230 (B) When the minimum value of any of R, G, and B is RGB (Min), RGB (Min) ⁇ 70 (C) RGB (Max) ⁇ RGB (Min) ⁇ 20.
- polypropylene-type resin expanded particle and its manufacturing method of one Embodiment of this invention are given in detail, giving an Example and a comparative example, it is not limited to these.
- the substances used were as follows, but were used without any particular purification.
- Polypropylene resin commercially available
- Carbon black / carbon black [Primary particle size 35nm]
- the particle size of carbon black was measured as follows. A cross-sectional view of the cell membrane of the obtained polypropylene resin expanded particles was taken with a transmission electron microscope at a magnification of 40,000 times.
- the mode value of the RGB value was carried out on 20 foamed particles, and the mode value (average value) of the RGB value was determined.
- the RGB value satisfying the following condition 1 is gray
- the RGB value satisfying the condition 2 is black
- the RGB value not satisfying the conditions 1 and 2 is evaluated as the other color did.
- RGB value satisfying condition 1 Black: RGB value satisfying condition 2 Other colors: RGB values not satisfying conditions 1 and 2.
- Condition 1 The mode value (average value) of RGB values is a value satisfying (a), (b) and (c); (A) When the maximum value of any of the R, G, and B values is RGB (Max), RGB (Max) ⁇ 230 (B) When the minimum value of any of R, G, and B is RGB (Min), RGB (Min) ⁇ 70 (C) RGB (Max) ⁇ RGB (Min) ⁇ 20
- Condition 2 The mode value (average value) of RGB values is a value satisfying (d), (e), and (f); (D) When the maximum value of any of R, G, and B is RGB (Max), RGB (Max) ⁇ 40 (E) RGB (Min) ⁇ 0 when the minimum value of any of R, G, B is RGB (Min) (F) RGB (Max) ⁇ RGB (Min) ⁇ 10 ⁇ Evaluation of color unevenness of expanded particles> Visual evaluation was performed on the 20 sheet-like samples in the image obtained by scanning with the color evaluation of the expanded particles, and the following criteria were used. ⁇ :
- the color unevenness of the expanded particles was digitized using the RGB values.
- the maximum value of RGB (Max) is RGB (Max) i
- the minimum value of RGB (Min) is RGB (Min) i
- the difference between RGB (Max) i and RGB (Min) i is 50 or less, color unevenness is hardly observed.
- the molded body produced according to the example was cut out to a thickness of 10 mm.
- a light source product name: iPhone 6 (iPhone is a registered trademark), manufactured by Apple Inc.
- the surface of the molded body was photographed with a camera (product name: EX-Z90, manufactured by CASIO) from a position 50 cm in height perpendicular to the photographing surface of the molded body.
- Example 1 [Production of polypropylene resin particles] 100 parts by weight of polypropylene resin, 4 parts by weight of carbon black, 0.5 parts by weight of polyethylene glycol, 0.05 parts by weight of talc and 0.10 parts by weight of magnesium hydroxide were weighed and dry blended. . The dry blended mixture was melt kneaded at a resin temperature of 220 ° C. using a twin screw extruder (manufactured by Toshiba Machine Co., Ltd., TEM26-SX), and the extruded strand was water-cooled in a 2 m long water tank. Cut to produce polypropylene resin particles (1.2 mg / grain).
- the autoclave contents were heated to a foaming temperature of 149.0 ° C. Thereafter, carbon dioxide as a foaming agent was additionally injected to increase the internal pressure of the autoclave to a foaming pressure of 3.3 MPa. After maintaining at the foaming temperature and foaming pressure for 30 minutes, the valve at the bottom of the autoclave is opened and released into the atmosphere at 95 ° C. through an opening orifice with a diameter of 3.6 mm to foam a polypropylene resin having a foaming ratio of about 20 times. Particles were obtained. At this time, the pressure was maintained with carbon dioxide so that the pressure in the container did not decrease during the discharge. The obtained polypropylene resin expanded particles were evaluated for color and color unevenness and average cell diameter. The results are shown in Table 1.
- the molded body was taken out to obtain a foamed molded body in a polypropylene resin mold.
- the obtained in-mold foam molded article was allowed to stand at 23 ° C. for 2 hours, then cured at 75 ° C. for 16 hours, and then allowed to stand in a 23 ° C. room for 4 hours, and then the surface appearance was evaluated.
- the results are shown in Table 1.
- FIG. 1 (1) shows the color of the surface of the in-mold foam molded body obtained in Comparative Example 2 of the present application
- FIG. 1 (2) shows the in-mold foam obtained in Comparative Example 1 of the present application.
- (3) of FIG. 1 shows the figure which shows the color of the surface of the in-mold foam molded object obtained in this-application Example 1.
- FIG. 1 (1) shows the color of the surface of the in-mold foam molded body obtained in Comparative Example 2 of the present application
- FIG. 1 (2) shows the in-mold foam obtained in Comparative Example 1 of the present application.
- (3) of FIG. 1 shows the figure which shows the color of the surface of the in-mold foam molded object obtained in this-application Example 1.
- the polypropylene resin expanded particles obtained by the production method of the present invention have a gray color and no color unevenness, and the in-mold expanded molded article has excellent surface appearance.
- Comparative Example 1 when at least one selected from magnesium hydroxide and magnesium carbonate is not added to the resin, it can be seen that the expanded particles are black.
- Comparative Example 2 when the amount of carbon black added is less than the range of the present invention, gray foam particles can be obtained, but it can be seen that there is color unevenness. It can be seen that, as in Comparative Examples 3 and 9, even if the amount of white talc added with the cell nucleating agent is increased, gray expanded particles having no color unevenness cannot be obtained.
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Abstract
Description
(i)ポリプロピレン系樹脂100重量部に対し、カーボンブラックを1.0重量部以上25重量部以下、水酸化マグネシウムおよび/または炭酸マグネシウムを0.05重量部以上1.0重量部以下含むポリプロピレン系樹脂粒子と、二酸化炭素とを密閉容器内で水系分散媒に分散させ、分散液を得る工程、
(ii)上記分散液を加熱および加圧する工程、および、
(iii)分散液に含まれるポリプロピレン系樹脂粒子を密閉容器の内圧よりも低い圧力域に放出する工程。
(a)R,G,Bの値のいずれかの最大値をRGB(Max)としたとき、RGB(Max)≦230
(b)R,G,Bの値のいずれかの最小値をRGB(Min)としたとき、RGB(Min)≧70
(c)RGB(Max)-RGB(Min)≦20。
(b)R,G,Bの値のいずれかの最小値をRGB(Min)としたとき、RGB(Min)≧70
(c)RGB(Max)-RGB(Min)≦20
また、本発明の一実施形態に係るポリプロピレン系樹脂発泡粒子は、ポリプロピレン系樹脂100重量部に対し、カーボンブラックを1.0重量部以上、水酸化マグネシウムおよび/または炭酸マグネシウムを0.05重量部以上1.0重量部以下含むポリプロピレン系樹脂粒子を、二酸化炭素を発泡剤として発泡することで得られ、均一で色調に優れたグレーを示す。また、本発明の一実施形態に係るポリプロピレン系樹脂発泡粒子を用いることにより、表面外観に優れた型内発泡成形体を得ることができる。なお、本明細書中、「ポリプロピレン系樹脂発泡粒子」を「発泡粒子」、「型内発泡成形体」を「成形体」とも称する。
(i)ポリプロピレン系樹脂100重量部に対し、カーボンブラックを1.0重量部以上25重量部以下、水酸化マグネシウムおよび/または炭酸マグネシウムを0.05重量部以上1.0重量部以下含むポリプロピレン系樹脂粒子と、二酸化炭素とを密閉容器内で水系分散媒に分散させ、分散液を得る工程、
(ii)上記分散液を加熱および加圧する工程、および、
(iii)上記分散液に含まれるポリプロピレン系樹脂粒子を密閉容器の内圧よりも低い圧力域に放出する工程。
ポリプロピレン系樹脂発泡粒子を、両刃カミソリ[フェザー製、ハイステンレス両刃]を用いて、発泡粒子の中央で切断する。該切断面を、光学顕微鏡[キーエンス社製、VHX-100]を用いて、倍率50倍にて観察して、切断面の画像を得る。得られた画像において、発泡粒子のほぼ中心を通る直線を引き、該直線が貫通している気泡数n、および、該直線と発泡粒子表面との交点から定まる発泡粒子径L(μm)を読み取り、次式より算出する。
平均気泡径(μm)=L/n
本発明の一実施形態におけるポリプロピレン系樹脂発泡粒子の色は、次のようにして測定、評価する。発泡粒子(サンプル)を二つの鋼板の間に挟み、ヤンキーバイスで発泡粒子をシート状になるまで圧縮する。その状態で固定したまま、乾燥機で30分間加熱(60℃)し、発泡粒子をシート状にする。得られたシート状のサンプルをプリンター複合機(iR-ADV C5035、キャノン社製)のスキャナー台に載せ、スキャンして得られた、シート状サンプルの表面の画像について、画像処理ソフト(DIBAS32)を用いてRGB分析を行い、得られたサンプル表面のRGB値の最頻値(測定値)を測定する。上記、RGB値の最頻値(測定値)の測定を発泡粒子20粒について実施し、得られた20枚のシート状サンプルのRGB値の最頻値(平均値)を求める。なお、RGB値の最頻値(平均値)は、サンプル1のRGB値の最頻値(測定値)=(R1,G1,B1)、サンプル2のRGB値の最頻値(測定値)=(R2,G2,B2)…サンプル20のRGB値の最頻値(測定値)=(R20,G20,B20)としたとき、RGB値の最頻値(平均値)=((R1+R2+…+R20)/20,(G1+G2+…+G20)/20,(B1+B2+…+B20)/20)と表される。
黒色:条件2を満たすRGB値
その他の色:条件1および2を満たさないRGB値。
(a)R,G,Bの値のいずれかの最大値をRGB(Max)としたとき、RGB(Max)≦230
(b)R,G,Bの値のいずれかの最小値をRGB(Min)としたとき、RGB(Min)≧70
(c)RGB(Max)-RGB(Min)≦20
条件2:RGB値の最頻値(平均値)が(d)、(e)および(f)を満たす値である;
(d)R,G,Bの値のいずれかの最大値をRGB(Max)としたとき、RGB(Max)≦40
(e)R,G,Bの値のいずれかの最小値をRGB(Min)としたとき、RGB(Min)≧0
(f)RGB(Max)-RGB(Min)≦10
上記のRGB(Max)、RGB(Min)について、例えばサンプルのRGB値の最頻値(平均値)がR=120、G=110、B=100である場合、RGB(Max)=120、RGB(Min)=100とする。
(i)ポリプロピレン系樹脂100重量部に対し、カーボンブラックを1.0重量部以上25重量部以下、水酸化マグネシウムおよび/または炭酸マグネシウムを0.05重量部以上1.0重量部以下含むポリプロピレン系樹脂粒子と、二酸化炭素とを密閉容器内で水系分散媒に分散させ、分散液を得る工程、
(ii)上記分散液を加熱および加圧する工程、および、
(iii)分散液に含まれるポリプロピレン系樹脂粒子を密閉容器の内圧よりも低い圧力域に放出する工程。
(a)R,G,Bの値のいずれかの最大値をRGB(Max)としたとき、RGB(Max)≦230
(b)R,G,Bの値のいずれかの最小値をRGB(Min)としたとき、RGB(Min)≧70
(c)RGB(Max)-RGB(Min)≦20。
(α)RGB(Max)i-RGB(Min)i≦50。
(a)R,G,Bの値のいずれかの最大値をRGB(Max)としたとき、RGB(Max)≦230
(b)R,G,Bの値のいずれかの最小値をRGB(Min)としたとき、RGB(Min)≧70
(c)RGB(Max)-RGB(Min)≦20。
○ポリプロピレン系樹脂(市販品)
・ポリプロピレン系樹脂:エチレン-プロピレンランダム共重合体[MFR=7.5g/10分、融点146.1℃]
○カーボンブラック
・カーボンブラック:[一次粒径35nm]
カーボンブラックの粒子径は以下のように測定した。得られたポリプロピレン系樹脂発泡粒子のセル膜の断面を、透過型電子顕微鏡にて4万倍に拡大した写真を撮影し、得られた透過型電子顕微鏡写真において、任意に50個のカーボンブラック一次粒子についてのX方向とY方向の粒子径(フェレ径)をそれぞれ測定し、平均値を算出し、カーボンブラックの粒子径とした。カーボンブラックはポリプロピレン系樹脂(MFR=7.5g/10分)中に、カーボンブラックを40重量%含有するカーボンブラックマスターバッチとして使用した。
○他の添加剤
・ポリエチレングリコール[ライオン(株)製、平均分子量300]
・タルク[林化成(株)製、タルカンパウダーPK-S]
・水酸化マグネシウム[堺化学工業製、MGZ-3]
・炭酸マグネシウム[神島化学工業製、金星]
以下、実施例および比較例において実施した評価方法に関して、説明する。
発泡倍率とは、ポリプロピレン系樹脂発泡粒子の重量w(g)を測定後、エタノールの入ったメスシリンダー中に沈め、メスシリンダーの水位上昇分(水没法)にて体積v(cm3)を測定し、ポリプロピレン系樹脂発泡粒子の真比重ρb=w/vを算出し、さらに、発泡前のポリプロピレン系樹脂粒子の密度ρrとの比(ρr/ρb)として算出した値である。
発泡粒子を二つの鋼板の間に挟み、ヤンキーバイスで発泡粒子をシート状になるまで圧縮した。その状態で固定したまま、乾燥機で30分間加熱(60℃)することで、発泡粒子をシート状にした。得られたシート状サンプルをプリンター複合機(iR-ADV C5035、キャノン社製)のスキャナー台に載せ、スキャンして得られた画像のシート状サンプルの中心から2mm×2mmの範囲について、画像処理ソフト(DIBAS32)を用いてRGB分析を行い、得られたシート状サンプルのRGB値の最頻値(測定値)を測定した。上記、RGB値の最頻値の測定を発泡粒子20粒について実施し、RGB値の最頻値(平均値)を求めた。得られたRGB値の最頻値(平均値)において、以下の条件1を満たすRGB値をグレー、条件2を満たすRGB値を黒色、条件1および2を満たさないRGB値をその他の色として評価した。下記のRGB(Max)、RGB(Min)について、例えばサンプルのRGB測定値がR=120、G=110、B=100とした場合、RGB(Max)=120、RGB(Min)=100とする。
黒色:条件2を満たすRGB値
その他の色:条件1および2を満たさないRGB値。
(a)R,G,Bの値のいずれかの最大値をRGB(Max)としたとき、RGB(Max)≦230
(b)R,G,Bの値のいずれかの最小値をRGB(Min)としたとき、RGB(Min)≧70
(c)RGB(Max)-RGB(Min)≦20
条件2:RGB値の最頻値(平均値)が(d)、(e)および(f)を満たす値である;
(d)R,G,Bの値のいずれかの最大値をRGB(Max)としたとき、RGB(Max)≦40
(e)R,G,Bの値のいずれかの最小値をRGB(Min)としたとき、RGB(Min)≧0
(f)RGB(Max)-RGB(Min)≦10
<発泡粒子の色ムラ評価>
発泡粒子の色評価でスキャンして得られた画像内の20枚のシート状サンプルに対して、目視評価を行い、下記の基準で評価した。
○:個々の発泡粒子表面にほとんどムラが無い。
×:個々の発泡粒子表面に色ムラが多く見られる。
ポリプロピレン系樹脂発泡粒子を、両刃カミソリ[フェザー製、ハイステンレス両刃]を用いて、発泡粒子の中央で切断した。該切断面を、光学顕微鏡[キーエンス社製、VHX-100]を用いて、倍率50倍にて観察して得られた画像において、発泡粒子のほぼ中心を通る直線を引き、該直線が貫通している気泡数n、および、該直線と発泡粒子表面との交点から定まる発泡粒子径L(μm)を読み取り、次式より算出した。
平均気泡径(μm)=L/n
上記、平均気泡径の算出をポリプロピレン系樹脂発泡粒子10粒について実施し、平均値を求めた。
得られた型内発泡成形体を目視で観察し、下記の基準で評価した。
○:成形体表面に凹凸がなく、皺が見られない。
×:成形体表面に凹凸があり、皺が見られる。
実施例に従い作製した成形体を、厚さ10mmに切り出した。光源(製品名:iPhone 6(iPhoneは登録商標)、Apple社製)を成形体から高さ50cm、成形体の撮影面に対して45°の角度に設置した。成形体の撮影面に対して垂直に高さ50cmの位置からカメラ(製品名:EX-Z90、CASIO社製)により、成形体の表面の撮影を行った。
[ポリプロピレン系樹脂粒子の作製]
ポリプロピレン系樹脂100重量部に対して、カーボンブラックを4重量部、ポリエチレングリコール0.5重量部、タルク0.05重量部、水酸化マグネシウム0.10重量部となるように計量し、ドライブレンドした。ドライブレンドした混合物を、二軸押出機[東芝機械(株)製、TEM26-SX]を用いて、樹脂温度220℃にて溶融混練し、押出されたストランドを長さ2mの水槽で水冷後、切断して、ポリプロピレン系樹脂粒子(1.2mg/粒)を製造した。
容量10Lの耐圧オートクレーブ中に、上述のようにして得られたポリプロピレン系樹脂粒子100重量部(2.4kg)、水200重量部、難水溶性無機化合物としての第三リン酸カルシウム[太平化学産業(株)製]0.5重量部、界面活性剤としてのアルキルスルホン酸ナトリウム(n-パラフィンスルホン酸ソーダ)[花王(株)製、ラテムルPS]0.03重量部を仕込んだ後、攪拌下、発泡剤として二酸化炭素を5重量部添加した。オートクレーブ内容物を昇温し、発泡温度149.0℃まで加熱した。その後、発泡剤である二酸化炭素を追加圧入してオートクレーブ内圧を発泡圧力3.3MPaまで昇圧した。前記発泡温度、発泡圧力で30分間保持した後、オートクレーブ下部のバルブを開き、直径3.6mmの開口オリフィスを通して、95℃雰囲気下の大気中に放出して発泡倍率約20倍のポリプロピレン系樹脂発泡粒子を得た。この際、放出中は容器内の圧力が低下しないように、二酸化炭素で圧力を保持した。得られたポリプロピレン系樹脂発泡粒子について、色と色ムラの評価および平均気泡径を測定した。結果を、表1に示す。
得られた発泡粒子をpH=1の塩酸水溶液、続いて、水で各30秒間洗浄し、75℃で乾燥した。洗浄後の発泡粒子を耐圧容器内に投入し、加圧空気を含浸させ、あらかじめ0.20MPa(絶対圧)の発泡粒子内圧になるように調整したポリプロピレン系樹脂発泡粒子を、縦300mm×横400mm×厚み50mmの金型内に充填した。金型チャンバー内を水蒸気にて10秒間加熱し、発泡粒子同士を融着させた。金型内および成形体表面を水冷した後、成形体を取り出して、ポリプロピレン系樹脂型内発泡成形体を得た。得られた型内発泡成形体は、23℃で2時間静置し、次に75℃で16時間養生した後、23℃の室内に4時間静置した後、表面外観について評価を実施した。結果を表1に示す。
[ポリプロピレン系樹脂粒子の作製]において、添加剤の種類および樹脂処方を表1、2に示すように変更し、[ポリプロピレン系樹脂発泡粒子の作製]において、発泡処方を表1、2に示すように変更した以外は、実施例1と同様の操作により、ポリプロピレン系樹脂粒子、ポリプロピレン系樹脂発泡粒子、ポリプロピレン系樹脂型内発泡成形体を作製した。得られたポリプロピレン系樹脂発泡粒子、ポリプロピレン系樹脂型内発泡成形体における評価結果を表1、2に示す。また、図1の(1)に、本願比較例2で得られた型内発泡成形体の表面の色を示す図、図1の(2)に、本願比較例1で得られた型内発泡成形体の表面の色を示す図、図1の(3)に、本願実施例1で得られた型内発泡成形体の表面の色を示す図を示す。
Claims (7)
- 以下の工程を含むことを特徴とする、ポリプロピレン系樹脂発泡粒子の製造方法:
(i)ポリプロピレン系樹脂100重量部に対し、カーボンブラックを1.0重量部以上25重量部以下、水酸化マグネシウムおよび/または炭酸マグネシウムを0.05重量部以上1.0重量部以下含むポリプロピレン系樹脂粒子と、二酸化炭素とを密閉容器内で水系分散媒に分散させ、分散液を得る工程、
(ii)上記分散液を加熱および加圧する工程、および、
(iii)分散液に含まれるポリプロピレン系樹脂粒子を密閉容器の内圧よりも低い圧力域に放出する工程。 - 上記水系分散媒が水であることを特徴とする、請求項1に記載のポリプロピレン系樹脂発泡粒子の製造方法。
- ポリプロピレン系樹脂粒子の軟化温度以上まで上記分散液を加熱することを特徴とする、請求項1または2に記載のポリプロピレン系樹脂発泡粒子の製造方法。
- ポリプロピレン系樹脂100重量部に対し、カーボンブラックを1.0重量部以上25重量部以下、水酸化マグネシウムおよび/または炭酸マグネシウムを0.05重量部以上1.0重量部以下含み、その表面の色が下記の(a)、(b)および(c)を満たすことを特徴とする、ポリプロピレン系樹脂発泡粒子。
(a)R,G,Bの値のいずれかの最大値をRGB(Max)としたとき、RGB(Max)≦230
(b)R,G,Bの値のいずれかの最小値をRGB(Min)としたとき、RGB(Min)≧70
(c)RGB(Max)-RGB(Min)≦20 - その表面の色が、下記の(α)を満たすことを特徴とする、請求項4に記載のポリプロピレン系樹脂発泡粒子。
(α)RGB(Max)i-RGB(Min)i≦50 - 上記ポリプロピレン系樹脂発泡粒子の平均気泡径が、100μm以上500μm以下であることを特徴とする、請求項4または5に記載のポリプロピレン系樹脂発泡粒子。
- 請求項4~6のいずれか1項に記載のポリプロピレン系樹脂発泡粒子から構成される発泡成形体。
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JP6655758B2 (ja) | 2020-02-26 |
EP3613801A4 (en) | 2020-12-23 |
JPWO2018193901A1 (ja) | 2019-12-12 |
EP3613801B1 (en) | 2023-03-01 |
CN110506071B (zh) | 2020-12-18 |
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